Pfeiffer, John E., author
McGraw-Hill , 1977
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Constable, George, author
Time-Life Books, 1973
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Childe, Gordon, author
Penguin Books, 1958
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Chakravarti, S.N.
Order Of The Trustees, 1950
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Constable, George
Time-life Int. (Nederland)B.V., 1974
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